<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--<input oninput="fn.call(this)" type="text">-->
<input oninput="fn(this)" type="text">
<div></div>
</body>
<script>
    const input = document.querySelector("input");
	const div = document.querySelector("div");
    const str = "你现在过的还好吗？";
	input.value = div.innerHTML = str;
	const fn = function(_this){
		// console.log(this)
		div.innerHTML = _this.value;
    }

</script>
</html>